IFR - Instrument Flight Rules

• 仪表飞行规则

IFR - Instrument Flight Rules的用法和样例：

例句

1. Flight rules are designed to prevent the chaos that would occur if everyone who piloted an airplane flew without regard for others.
   制定飞行规则是为了避免假如每个人都自己飞行而不顾他人所讲造成的混乱局面。